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How is it possible they can do double anal, extreme anal positions?

Are they doped or on morfin to not have Any pain?

And what do they earn for a Waka scene?

They are extremely fit and most experts at yoga. They also practice anal with toys everyday and will wear a butt plug overnight before a scene.

This and other factors actually:
Important is also the ability to turn pain into lust. You clearly see it with some of the better DAP footage.
High payment motivation is also an important factor.
Crucially important are the right positions.
Mental relax, some relaxing lube.

Lol why are you asking about Barbie??? Shes done Qap ffs.

I think what you meant to ask is how can girls like Polly, and other smalls gals can take big dicks DAP.....

It's simple....Like stretching your legs before a run. It's a muscle. Muscles stretch....Not hard to figure out....